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Last Updated On 01-06-2023 - By Jeesha Sara

An electric cable of copper has just one wire of radius 9 mm. Its resistance is . This single copper wire of cable is replaced by 6 different well insulated copper wires each of radius 3 mm. The total resistance of the cable will now be equal to

a)

b)

c)

d)


Question ID - 150316 :-

An electric cable of copper has just one wire of radius 9 mm. Its resistance is . This single copper wire of cable is replaced by 6 different well insulated copper wires each of radius 3 mm. The total resistance of the cable will now be equal to

a)

b)

c)

d)

1 Answer
5876 Votes
3537

Answer Key : (a) -

(a)

For one wire cable,

Resistance,

For other wire of cable,

Resistance,

When six wires each of resistance  are connected in parallel, their effective resistance will be



Next Question :

Two resistance  and  are joined as shown in the figure to two batteries of e.m.f.   and  If  is short-circuited, the current through  is

a)

b)

c)

d)


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